KR20230018985A - Liquefied gas storage tank, vessel having the same and manufacturing method of liquefied gas storage tank - Google Patents

Abstract

A liquefied gas storage tank of the present invention includes: a primary barrier made of metal forming a receiving space for containing cryogenic substances; a primary insulation wall provided outside the primary barrier; a connection insulation wall provided in the space between neighboring primary insulation walls; a secondary barrier provided outside the primary insulation wall; and a secondary insulation wall provided on the outside of the secondary barrier. The connection insulation wall is disposed on the secondary barrier and includes a plurality of unit connection insulation walls arranged side by side in a direction parallel to the space between the neighboring primary insulation walls. A unit connection insulation wall coated with a first adhesive on the lower surface of the plurality of unit connection insulation walls is installed on the secondary barrier in the space between the neighboring primary insulation walls to fix the connection insulation wall and the secondary barrier. The unit connection insulation wall coated with a second adhesive on the side is attached to the side of the unit connection insulation wall coated with the first adhesive on the lower surface to connect the neighboring unit connection walls. Accordingly, the manufacturing time of a liquefied gas storage tank can be shortened.

Description

A liquefied gas storage tank and a method for manufacturing a vessel and a liquefied gas storage tank including the same

The present invention relates to a liquefied gas storage tank, a ship including the same, and a method for manufacturing the liquefied gas storage tank.

In order to store and transport materials such as hydrogen, oxygen, and natural gas in large quantities, hydrogen, oxygen, and natural gas are mainly converted into high-pressure and low-temperature liquefied gas through a low-temperature liquefaction method. In designing an insulated container for storing and transporting such a low-temperature liquefied gas, an insulation technique for preventing boiling of the liquefied gas due to heat intrusion from the outside is important.

Insulation methods that are currently commercially applied include an external insulation method and an internal insulation method. Since the internal insulation method can control the temperature of the container enclosure similarly to the outside air temperature, there is an advantage in that there is no restriction on the use of materials such as the application of low-temperature materials. As such an internal insulation method, a membrane type insulation system having a double barrier structure based on an intermediate barrier structure is known.

The membrane insulation system has a double barrier structure including upper/lower insulation panels as insulation members, a membrane metal panel forming a primary barrier on the upper insulation panel, and a secondary barrier installed between the upper/lower insulation panels. can have

The secondary barrier is the space formed between the upper and lower insulation panels, that is, the rigid secondary barrier is attached to the upper surface of the lower insulation panel, and the gap between the laminates of the lower insulation panel and the rigid secondary barrier is covered by the secondary barrier. can have a structure.

On the other hand, adjacent upper insulation panels are disposed spaced apart from each other, and a connection insulation panel may be disposed in the spaced apart space. Connected insulation panels can be placed on the secondary barrier using adhesives.

As the above-described connected insulation panel is adhered on the secondary barrier using an adhesive, sufficient time is required for the adhesive to cure or dry.

The present invention was created to solve the problems of the prior art as described above, and one object of the present invention is to provide a liquefied gas storage tank capable of reducing manufacturing time and a method for manufacturing a ship and a liquefied gas storage tank including the same it is for

A liquefied gas storage tank according to an aspect of the present invention includes a primary barrier made of a metal material to form an accommodation space for accommodating cryogenic substances; a primary insulation wall provided outside the primary barrier; Connection insulation walls provided in the space between neighboring primary insulation walls; a secondary barrier provided outside the primary thermal insulation wall; And a plurality of secondary thermal insulation walls provided outside the secondary barrier, wherein the connection thermal insulation walls are disposed on the secondary barrier and are arranged side by side in a direction parallel to the space between the adjacent primary thermal insulation walls. A unit connection insulation wall having a first adhesive applied to a lower surface of the plurality of unit connection insulation walls is installed on the secondary barrier in the space between the adjacent primary insulation walls, The connection insulation wall and the secondary barrier are fixed, and a unit connection insulation wall having a second adhesive applied to a side surface is attached to a side of a unit connection insulation wall having a first adhesive applied to the lower surface, thereby connecting the neighboring unit. Walls can be connected.

Specifically, the unit connection insulating walls to which the first adhesive is applied to the lower surface may be installed at the front end or the rear end of the space between the adjacent primary insulating walls.

Specifically, the unit connection insulating walls to which the first adhesive is applied to the lower surface may be installed in the central portion of the space between the adjacent primary insulating walls.

Specifically, the first adhesive and the second adhesive may include the same material.

A vessel according to an aspect of the present invention includes a hull; And it may be provided with the above-described liquefied gas storage tank installed on a part of the hull.

A method of manufacturing a liquefied gas storage tank according to an aspect of the present invention includes installing a plurality of unit heat insulating structures including a secondary heat insulating wall, a main barrier and a first heat insulating wall on a hull; Installing an auxiliary barrier covering a gap between neighboring secondary insulation walls; Installing a connection insulating wall in a space between neighboring primary insulating walls; and installing a first barrier on the primary insulation wall and the connection insulation wall, wherein the connection insulation wall includes a plurality of units arranged side by side in a direction parallel to a space between the adjacent primary insulation walls. A connection insulation wall is included, and the step of installing the connection insulation wall includes a unit connection insulation wall having a first adhesive applied to a lower surface of the plurality of unit connection insulation walls, and a space between the adjacent primary insulation walls. installing on an auxiliary barrier; and attaching the remaining unit connection insulating walls to which the second adhesive is applied to side surfaces of the unit connection insulation walls to which the first adhesive is applied to the lower surface.

The liquefied gas storage tank according to the present invention and the manufacturing method of the vessel and the liquefied gas storage tank including the same reduce the curing time of the adhesive for bonding the connecting insulation wall to the secondary barrier, thereby reducing the manufacturing time of the liquefied gas storage tank. can

1 is a partial cross-sectional view for explaining a liquefied gas storage tank according to an embodiment of the present invention.
2 is a partially exploded perspective view for explaining the liquefied gas storage tank shown in FIG. 1;
3 is a view for explaining a primary barrier of the liquefied gas storage tank shown in FIGS. 1 and 2;
4 to 5 are partial perspective views for explaining a manufacturing method of a liquefied gas storage tank according to an embodiment of the present invention.

Objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In adding reference numerals to components of each drawing in this specification, it should be noted that the same components have the same numbers as much as possible, even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in this specification, the technical idea disclosed in this specification is not limited by the accompanying drawings, and all changes included in the spirit and technical scope of the present invention , it should be understood to include equivalents or substitutes.

In addition, terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

Hereinafter, in the present specification, liquefied gas may be used to encompass all gaseous fuels that are generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, etc., and for convenience, liquefied gas can be expressed as This can be applied to boil-off gas as well. In addition, for convenience, LNG may be used to encompass not only NG (Natural Gas) in a liquid state but also LNG in a supercritical state. can

In addition, the present invention includes a ship equipped with a liquefied gas storage tank described below. At this time, the ship can be a ship that uses at least liquefied gas as a propulsion fuel/power generation fuel, and is a concept that includes all gas carriers, merchant ships that carry non-gas cargo or people, FSRU, FPSO, Bunkering vessel, and offshore plants. .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a partial cross-sectional view for explaining a liquefied gas storage tank according to an embodiment of the present invention, FIG. 2 is a partially exploded perspective view for explaining the liquefied gas storage tank shown in FIG. 1, and FIG. It is a view for explaining the primary barrier of the liquefied gas storage tank shown in FIG. 2, and FIGS. 4 and 5 are partial perspective views for explaining a manufacturing method of the liquefied gas storage tank according to an embodiment of the present invention.

Referring to FIGS. 1 to 5 , the liquefied gas storage tank 1 is provided on a ship and can store liquefied gas such as LNG, which is a cryogenic (about -160°C to -170°C) material.

Although not shown, a ship equipped with a liquefied gas storage tank 1 described below is a concept encompassing offshore structures that perform specific tasks by floating at a certain point in the sea in addition to commercial ships that transport cargo from a departure point to a destination. can In addition, in the present invention, the liquefied gas storage tank 1 may include any type of tank for storing liquefied gas.

The liquefied gas storage tank (1) has a primary barrier (2) in contact with the liquefied gas, a primary insulation wall (3) installed outside the primary barrier (2), and an outer side of the primary insulation wall (3). It may be configured to include a secondary barrier 4 to be installed and a secondary insulation wall 5 disposed outside the secondary barrier 4. The liquefied gas storage tank 1 may be supported on the hull 7 by the mastic 6 installed between the secondary insulation wall 5 and the hull 7.

The liquefied gas storage tank 1 may need to optimize the thickness of the primary insulation wall 3 and the secondary insulation wall 5 in order to optimize insulation performance and storage capacity. For example, when polyurethane foam is used as the main material of the primary insulation wall (3) and the secondary insulation wall (5), the thickness of the primary insulation wall (3) and the thickness of the secondary insulation wall (5) are combined. The overall thickness can be in the range of 250 mm to 500 mm.

The liquefied gas storage tank 1 may include flat and corner structures. For example, the horizontal walls in the front and rear directions of the liquefied gas storage tank 1, the floor between the horizontal walls, the vertical walls, and the ceiling may correspond to a planar structure. Also, for example, a structure in which a horizontal wall, a floor, a vertical wall, and a ceiling of the liquefied gas storage tank 1 meet may correspond to a corner structure. Here, the corner structure may include an obtuse corner structure or a right angle corner structure. When the thickness of the primary insulating wall 3 or the secondary insulating wall 5 is changed, a change in an obtuse corner structure or a right angle corner structure may be accompanied.

The primary barrier 2 forms an accommodation space for accommodating liquefied gas, which is a cryogenic material, and may be made of a metal material. For example, the metal material may be stainless steel, but is not limited thereto. The primary barrier (2), together with the secondary barrier (4) can prevent the liquefied gas from leaking to the outside.

The primary barrier 2 is fixedly coupled to the upper portion of the primary insulation wall 3 by an anchor strip (not shown) so that it directly contacts the liquefied gas, which is a cryogenic material stored in the liquefied gas storage tank 1. can be installed

The primary barrier 2 includes a flat portion 21 in contact with the upper surface of the primary insulating wall 3, a curved portion 22 for relieving contraction or expansion stress due to temperature, and a flat portion 21 and the boundary portion 23 between the curved portion 22. For example, it may be formed of a corrugation membrane sheet made of stainless steel with a thickness of 1.0 to 1.5 mm, preferably stainless steel with a thickness of 1.0 to 1.2 mm. That is, the primary barrier may be formed in a wrinkled shape.

The primary barrier 2 may be formed to have a wrinkle shape having a first radius of curvature R1 and a second radius of curvature R2. That is, the primary barrier 2 of this embodiment forms a first radius of curvature R1 at the boundary 23 between the flat portion 21 and the curved portion 22, and the curved portion 22 has a second radius of curvature. It can be formed to have two types of curvature radii (R1, R2) constituting (R2). For example, the first radius of curvature R1 may be smaller than the second radius of curvature R2. The primary barrier 2 having curvature radii (R1, R2) is easy to weld inspection because the upper part forms a gentle curve, and also can flexibly respond to sloshing because the fluid hitting from the side flows directly .

In addition, the primary barrier 2 may be formed to have the same size of horizontal and vertical wrinkles in all regions without distinction between large corrugation and small corrugation. That is, since the size of horizontal and vertical wrinkles is the same in the entirety of the first barrier 2, the production of the first barrier 2 can be facilitated.

The primary insulation wall 3 is designed to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside, and the primary barrier 2 and the secondary barrier ( 4) can be installed between

The primary insulating wall 3 may have a structure in which the primary plywood 31 and the primary insulating material 32 are sequentially laminated to the outside of the primary barrier 2, and the primary plywood 31 It may correspond to the thickness of the sum of the thickness and the thickness of the primary insulator (32). The primary insulation wall 3 may be formed to a thickness of 100 mm to 250 mm. In addition, the thickness of the primary insulation wall 3 may occupy 25% to 75% of the total thickness of the liquefied gas storage tank 1.

The primary insulation wall 3 is designed to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside, and the primary barrier 2 and the secondary barrier ( 4) can be installed between

The primary plywood 31 may be installed between the primary barrier 2 and the primary insulator 32 . The primary plywood 31 may be formed to a thickness of 6.5 mm to 200 mm.

The primary insulator 32 may be formed of a material having excellent thermal insulation performance and excellent mechanical strength so as to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside. there is.

The primary insulation material 32 may be formed of polyurethane foam between the primary plywood 31 and the secondary barrier 4, and may be formed to a thickness of 100 mm to 250 mm. In addition, the thickness of the primary insulator 32 may occupy 25% to 75% of the total thickness of the liquefied gas storage tank 1.

A part of the primary insulation wall 3, the secondary barrier 4 and the secondary insulation wall 5 may be stacked to form a unit element. Here, a part of the primary insulating wall 3 constituting the unit element can be defined as a fixed insulating wall 3b, and the width has a smaller width than the width of the secondary insulating wall 5 included in the unit element. can In addition, the fixed insulation wall (3b), the secondary barrier (4) and the secondary insulation wall (5) may be disposed in a pre-fixed state, but are not limited thereto, and each is separated and the liquefied gas storage tank (1) ) may be placed in Due to this, a part of the secondary barrier 4 may be exposed on both sides of the primary insulation wall 3 . The unit elements may be disposed adjacent to each other, and at this time, a connection insulating wall 3a may be installed in a space between neighboring primary insulating walls 3, that is, a space in which the secondary barrier 4 is exposed.

The connection insulation wall (3a) may be provided in a laminated form of the same or similar connection plywood (31a) and connection insulation material (32a) as described in the primary insulation wall (3) constituting a unit element, in this specification 1 It should be noted that the secondary insulation wall 3 can encompass the connection insulation wall 3a and the fixed insulation wall 3b.

The connection insulating wall 3a may include a plurality of unit connection insulating walls 3aU. A plurality of unit connection insulating walls 3aU may be arranged along the space between adjacent primary insulating walls 3 .

A first adhesive 3aB1 may be applied to lower surfaces of some of the plurality of unit connection insulating walls 3aU. For example, among the plurality of unit connection insulation walls 3aU, the first adhesive 3aB1 is applied to the lower surface of the front unit connection insulation wall 3aU or the rear unit connection insulation wall 3aU to connect the connection insulation wall ( 3a) can be fixed to the secondary barrier (4).

On the other hand, in the present embodiment, as an example, the first adhesive 3aB1 is applied to the lower surface of the front unit connection insulation wall 3aU or the rear unit connection insulation wall 3aU among the plurality of unit connection insulation walls 3aU. Although described, it is not limited thereto. For example, the first adhesive (3aB1) is applied to the lower surface of the central unit connection insulation wall (3aU) among the plurality of unit connection insulation walls (3aU) so that the connection insulation wall (3a) is attached to the secondary barrier (4). may be fixed.

In addition, the plurality of unit connection insulating walls 3aU may be connected through the second adhesive 3aB2 applied to the side surface of each unit connection insulating wall 3aU. That is, the second adhesive 3aB2 may be applied between adjacent unit connection insulating walls 3aU. Here, the second adhesive 3aB2 may include the same material as the first adhesive 3aB1.

The connection insulating wall 3a may have a structure in which a connection plywood 31a and a connection insulation material 32a are stacked. The thickness of the connection insulating wall 3a may correspond to the sum of the thickness of the connection plywood 31a and the thickness of the connection insulation 32a.

The connection plywood 31a may be formed to a thickness of 6.5 mm to 200 mm.

The connection insulator 32a may be formed of polyurethane foam between the connection plywood 31a and the secondary barrier 42 of the secondary barrier 4, and may be formed to a thickness of 100 mm to 250 mm. In addition, the thickness of the connection insulator 32a may occupy 25% to 75% of the total thickness of the liquefied gas storage tank 1 .

As described above, the primary insulating material 32 of the primary insulating wall 3 and the connecting insulating material 32a of the connecting insulating wall 3a may have the same thickness. However, in the case of the connection insulator 32a of the connection insulation wall 3a, since the auxiliary barrier 42 is further laminated in addition to the main barrier 41 of the secondary barrier 4 at the bottom, the connection of the connection insulation wall 3a The heat insulating material (32a) may have a thickness smaller than the thickness of the secondary barrier (42) than the thickness of the primary heat insulating material (32) of the primary heat insulating wall (3).

When the unit elements are arranged next to each other, the above-described connecting insulating walls 3a block heat intrusion from the outside while sealing a portion of the space formed between the neighboring secondary insulating walls 5 together with the auxiliary barrier 42. It can be installed to perform the role of

The secondary barrier 4 can be divided into a main barrier 41 and an auxiliary barrier 42, the main barrier 41 is installed on top of the secondary insulation wall 5 in the unit element, the secondary barrier 42 ) may be installed between the exposed main barrier 41 and the connection insulating wall 3a. At this time, the auxiliary barrier 42 may be provided to interconnect the main barrier 41 provided in unit elements adjacent to each other. That is, unit elements disposed adjacent to each other may be closed by the auxiliary barrier 42 and the connection insulating wall 3a stacked on the main barrier 41 .

The main barrier 41 and the secondary barrier 42 may have the same composite sheet structure as the secondary barrier 4.

The secondary barrier 4 is basically formed by bonding glass fiber sheets to both sides of an aluminum sheet, and may have different stiffness depending on the thickness of the aluminum sheet or the resin used. A rigid secondary barrier made by impregnating a thermosetting resin into a glass fiber sheet is called a Rigid Secondary Barrier (RSB), and a ductile secondary barrier made by attaching a glass fiber sheet to an aluminum sheet using an adhesive This is called a flexible secondary barrier (FSB).

In this embodiment, the main barrier 41 may be composed of a rigid secondary barrier, and the auxiliary barrier 42 may be composed of a soft secondary barrier.

In addition, the secondary barrier (4) may be installed between the primary thermal insulation wall (3) and the secondary thermal insulation wall (5) covering the connection thermal insulation wall (3a), and liquefy with the primary barrier (2). Gas can be prevented from leaking to the outside.

The secondary barrier 4 at the bottom of the fixed insulation wall 3b includes the main barrier 41 as a single barrier, and the secondary barrier 4 at the bottom of the connection insulation wall 3a connects the main elements to each other. It may include a barrier 41 and an auxiliary barrier 42 provided on the secondary insulation wall 5 constituting a unit element.

The main barrier 41 is provided on the secondary insulation wall 5 constituting a unit element and may be formed to a thickness of 0.6 mm to 1.0 mm, and the main barrier 41 adjacent to each other has auxiliary barriers 42 stacked. Confidentiality can be achieved.

The auxiliary barrier 42 may be formed to a thickness of 0.6 mm to 1.0 mm as a configuration connecting unit elements to each other and may be laminated on the main barrier 41 .

On the other hand, the secondary insulation wall 5, together with the fixed insulation wall 3b and the connection insulation wall 3a, blocks heat penetration from the outside while preventing shock from the outside or impact caused by liquefied gas sloshing from the inside. It can be designed to withstand. In addition, the secondary insulation wall 5 may be installed between the secondary barrier 4 and the hull 7, and may include a secondary insulation 51 and a secondary plywood 52.

The secondary insulation wall 5 may have a structure in which the secondary insulation 51 and the secondary plywood 52 are sequentially laminated to the outside of the secondary barrier 4, and the secondary insulation 51 The total thickness of the combined thickness and the thickness of the secondary plywood 52 may be formed to a thickness of 100 mm to 250 mm. In addition, the thickness of the secondary insulation wall 5 may occupy 25% to 75% of the total thickness of the liquefied gas storage tank 1.

The secondary insulator 51 may be formed of a material having excellent thermal insulation performance and excellent mechanical strength so as to withstand an impact from the outside or an impact caused by liquefied gas sloshing from the inside while blocking heat intrusion from the outside. there is.

The secondary insulation 51 may be formed of polyurethane foam between the secondary barrier 4 and the secondary plywood 52, and may be formed to a thickness of 100 mm to 250 mm. In addition, the thickness of the secondary insulator 51 may occupy 25% to 75% of the total thickness of the liquefied gas storage tank 1 .

The secondary plywood 52 may be installed between the secondary insulator 51 and the hull 7. For example, also, the secondary insulator 51 may be installed in contact with the secondary plywood 52 . The secondary plywood 52 may be formed to a thickness of 6.5 mm to 200 mm.

On the other hand, in the liquefied gas storage tank 1 according to this embodiment, the primary insulation wall 3 has a thickness of 66% to 166% of the secondary insulation wall 5, and the primary insulation wall 3 So that the covered connection insulation wall (3a) has a thickness of 67% to 167% of the secondary insulation wall (5), so that the connection insulation wall (3a) has the same or similar thickness as the secondary insulation wall (5) can be configured. To be associated with this configuration, the connection insulation 32a of the connection insulation wall 3a has a thickness of 90% to 110% of the secondary insulation 51, so that the connection insulation 32a of the connection insulation wall 3a It may be configured to have the same or similar thickness as the secondary insulator 51 . In this embodiment, the fixed insulation wall (3b) portion constituting the unit element when encompassing the connection insulation wall (3a) is not described in detail, but the fixed insulation wall (3b) is also connected in relation to the secondary insulation wall (5). It may be the same as or similar to the insulating wall 3a.

When the connection insulation wall 3a and the secondary insulation wall 5 or the connection insulation 32a and the secondary insulation 51 of the connection insulation wall 3a are formed at this thickness ratio, the secondary barrier 4 The upper limit value of stress at low temperature may correspond to 50 MPa or less in the lower portion of the connection insulating wall 3a. In addition, specifically, the stress value of the secondary barrier 4 at a low temperature may be 40 MPa to 50 MPa at the lower portion of the connection insulating wall 3a.

As described above, in the liquefied gas storage tank of the present invention, the connection insulating wall 3a includes a plurality of unit connection insulation walls 3aU, and only the lower surface of a part of the plurality of unit connection insulation walls 3aU has a second second insulation wall. An adhesive (3aB2) may be applied to fix the connection insulating wall (3a) and the secondary barrier (4).

In the following, a manufacturing method of the liquefied gas storage tank 1 of the present invention will be described with reference to FIGS. 4 and 5 .

First, referring to FIG. 4 , a unit insulation structure having a secondary insulation wall 5, a main barrier 41 and a primary insulation wall 3 is prepared.

The unit insulation structure may be manufactured as follows.

First, the secondary heat insulating wall 5 is prepared. The secondary insulating wall 5 may include a secondary insulating material 51 and a secondary plywood 52 . Here, the secondary insulator 51 is disposed adjacent to the hull 7, and the secondary plywood 52 may be disposed on the secondary insulator 51.

In addition, a heat insulating material such as glass wool or glass cloth may be filled between adjacent secondary heat insulating walls 4 for heat insulating performance.

Then, the main barrier 41 may be installed on the secondary insulation wall 5 including the secondary insulation 51 and the secondary plywood 52 . The main barrier 41 may be provided on the secondary insulator 51 and cover the secondary insulator 51 . In addition, the main barrier 41 may have a structure in which glass fiber sheets are bonded to both sides of an aluminum sheet. Here, the glass fiber sheet may be impregnated with a thermosetting resin to have rigidity. That is, the main barrier 41 may be a rigid secondary barrier (RSB).

After installing the main barrier 41 on the secondary insulation wall 5, the primary insulation wall 3 is installed on the main barrier 41 to manufacture a unit insulation structure. Here, the width and length of the primary thermal insulation wall 3 may be smaller than the width and length of the secondary thermal insulation wall 5 .

The primary insulating wall 3 may include a primary plywood 31 and a primary insulating material 32 . The primary plywood 31 is provided on the primary insulator 32, and the primary insulator 32 may be provided between the main barrier 41 and the primary plywood 31.

On the other hand, the primary insulation wall 3 may be manufactured in various shapes. For example, the primary insulating wall 3 may be manufactured by installing a primary insulating material 32 on the main barrier 41 and installing a primary plywood 31 on the primary insulating material 32. there is. In addition, the primary insulating wall 3 may be manufactured by installing a laminate of the primary insulating material 32 and the primary plywood 31 on the main barrier 41.

After preparing the unit heat insulation structure, a plurality of unit heat insulation structures are installed on the inner surface of the hull 7. Here, the mystic may be pre-installed on the surface of the secondary plywood 52 of the unit heat insulating structure. Adjacent unit insulation structures may be spaced apart from each other by a predetermined interval. Accordingly, a predetermined space may be formed between the adjacent primary thermal insulation walls 3 and a predetermined gap may occur between the adjacent secondary thermal insulation walls 5 .

After installing a plurality of unit insulation structures, the secondary barrier 4 may be manufactured by installing an auxiliary barrier 42 covering a gap between adjacent secondary thermal insulation walls 5 . That is, the secondary barrier 4 may be composed of a main barrier 41 and an auxiliary barrier 42 .

Here, the auxiliary barrier 42 may have a structure in which a glass fiber sheet is attached to an aluminum sheet using an adhesive. Thus, the auxiliary barrier 42 may be a flexible secondary barrier (FSB) having ductility.

Referring to FIG. 5 , after installing the auxiliary barrier 42 , a connection insulating wall 3a is installed on the auxiliary barrier 42 of the space between the adjacent primary insulating walls 3 . Here, the connection insulating wall 3a may include a plurality of unit connection insulating walls 3aU.

A plurality of unit connection insulating walls 3aU may be sequentially installed on the secondary barrier 42 of the space between adjacent primary insulating walls 3 .

In more detail, the first adhesive 3aB1 is applied to the lower surface of one of the plurality of unit connection insulating walls 3aU, and the unit connection insulating wall 3aU to which the first adhesive 3aB1 is applied to the lower surface may be installed in the space between the neighboring primary insulation walls (3). Here, the unit connection insulating walls 3aU to which the first adhesive 3aB1 is applied to the lower surface may be installed at the front end or the rear end of the space between the adjacent primary insulating walls 3.

Then, the second adhesive 3aB2 is applied to the side of the other unit connection insulation wall 3aU, and the unit connection insulation wall 3aU to which the second adhesive 3aB2 is applied is first installed on the unit connection insulation wall ( 3aU) can be attached to the side.

Subsequently, the second adhesive 3aB2 is applied to the side surface of the remaining unit connection insulation wall 3aU, and the primary insulation adjacent to the connection insulation wall 3a is adhered to the side surface of the previously installed unit connection insulation wall 3aU. It can be installed in the space between the walls (3).

By sequentially joining the above-described plurality of unit connection insulation walls 3aU, the connection insulation walls 3a may be installed in spaces between adjacent primary insulation walls 3 .

On the other hand, in this embodiment, the unit connection insulating wall (3aU) to which the first adhesive (3aB1) is applied at the bottom is installed at the front or rear end of the space between the neighboring primary insulating walls (3), and the second adhesive ( 3aB2) has been described as an example of continuously installing the unit connection insulating wall 3aU applied, but is not limited thereto. For example, after installing the unit connection insulating wall 3aU to which the first adhesive 3aB1 is applied at the lower portion in the center of the space between the adjacent primary insulating walls 3, the second adhesive 3aB2 is applied to the side surface. It is also possible to install the coated unit connection insulation walls (3aU) on both sides.

After installing the connection insulation wall 3a using the unit connection insulation wall 3aU, as shown in FIGS. 1 to 3, 1 on the primary insulation wall 3 and the connection insulation wall 3a By installing the secondary barrier 2, it is possible to manufacture a liquefied gas storage tank according to an embodiment of the present invention.

Here, the primary barrier 2 forms an accommodation space for accommodating liquefied gas, which is a cryogenic material, and may be made of a metal material. The primary barrier (2), together with the secondary barrier (4) can prevent the liquefied gas from leaking to the outside.

The primary barrier 2 includes a flat portion 21 in contact with the upper surface of the primary insulating wall 3, a curved portion 22 for relieving contraction or expansion stress due to temperature, and a flat portion 21 and the boundary portion 23 between the curved portion 22. That is, the primary barrier 2 may be formed in a wrinkled shape.

As described above, the connection insulation wall 3a is installed in the space between the adjacent primary insulation walls 3 using a plurality of unit connection insulation walls 3aU, so that the lower surface of the unit connection insulation wall 3aU The time for hardening of the first adhesive 3aB1 applied to may be shortened. That is, while another unit connection wall 3aU is installed using the second adhesive 3aB2 on the side of the unit connection insulating wall 3aU to which the first adhesive 3aB1 is applied to the lower surface, the first adhesive 3aB1 ) can be cured. Accordingly, the time for manufacturing the liquefied gas storage tank 1 can be shortened.

The present invention is not limited to the embodiment described above, and may include a combination of at least two or more of the above embodiments or a combination of at least one of the above embodiments and known technology as a new embodiment. Of course.

Although the present invention has been described in detail through specific examples, this is for explaining the present invention in detail, the present invention is not limited thereto, and within the technical spirit of the present invention, by those skilled in the art It will be clear that the modification or improvement is possible.

Simple variations or modifications of the present invention all fall within the scope of the present invention, and the specific protection scope of the present invention will be clarified by the appended claims.

1: liquefied gas storage tank 2: primary barrier
2a: unit barrier 21: flat part
22: curved portion 23: boundary portion
3: primary insulation wall 3b: fixed insulation wall
31: primary plywood 32: primary insulation
3a: connection insulation wall 3aU: unit connection insulation wall
3aB1: first adhesive 3aB12: second adhesive
31a: connection plywood 32a: connection insulation
4: Secondary barrier 41: Main barrier
42: auxiliary barrier 5: secondary insulation wall
51: secondary insulation 52: secondary plywood
6: mastic 7: hull

Claims (8)

A primary barrier made of metal forming an accommodation space for accommodating cryogenic substances;
a primary insulation wall provided outside the primary barrier;
Connection insulation walls provided in the space between neighboring primary insulation walls;
a secondary barrier provided outside the primary thermal insulation wall; and
Including a secondary insulation wall provided on the outside of the secondary barrier,
The connection insulation wall is disposed on the secondary barrier and includes a plurality of unit connection insulation walls arranged side by side in a direction parallel to the space between the neighboring primary insulation walls,
A unit connection insulation wall having a first adhesive applied to a lower surface of the plurality of unit connection insulation walls is installed on the secondary barrier in a space between the adjacent primary insulation walls, and is installed on the connection insulation wall and the secondary barrier. is fixed,
A liquefied gas storage tank in which a unit connection insulating wall having a second adhesive applied to its side surface is attached to a side of the unit connection insulating wall having a first adhesive applied to the lower surface, so that the adjacent unit connection walls are connected. According to claim 1,
The unit connection insulating wall to which the first adhesive is applied to the lower surface is installed at the front or rear end of the space between the neighboring primary insulating walls. According to claim 1,
The unit connection insulating wall to which the first adhesive is applied to the lower surface is installed in the central portion of the space between the neighboring primary insulating walls. According to claim 1,
Wherein the first adhesive and the second adhesive include the same material. hull; and
A ship comprising the liquefied gas storage tank according to any one of claims 1 to 4 installed on a part of the hull. Installing a plurality of unit insulation structures including a secondary insulation wall, a main barrier and a first insulation wall on the hull;
Installing an auxiliary barrier covering a gap between neighboring secondary insulation walls;
Installing a connection insulating wall in a space between neighboring primary insulating walls; and
Installing a primary barrier on the primary thermal insulation wall and the connection thermal insulation wall,
The connection insulation wall includes a plurality of unit connection insulation walls arranged side by side in a direction parallel to the space between the neighboring primary insulation walls,
The step of installing the connection insulation wall
installing a unit connection insulation wall having a first adhesive applied to a lower surface of the plurality of unit connection insulation walls on the auxiliary barrier in a space between the neighboring primary insulation walls; and
A method of manufacturing a liquefied gas storage tank comprising the step of attaching the remaining unit connection insulating walls to which the second adhesive is applied to side surfaces of the unit connection insulation walls to which the first adhesive is applied to the lower surface. According to claim 6,
The unit connection insulating wall to which the first adhesive is applied to the lower surface is installed at the front or rear end of the space between the neighboring primary insulating walls. According to claim 6,
The method of manufacturing a liquefied gas storage tank in which the unit connection insulating wall to which the first adhesive is applied to the lower surface is installed in the central portion of the space between the neighboring primary insulating walls.

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